Of course :) The books marked with ** are books I’ve read personally and recommend. “Two boys simply falling in love” implies you’re after YA, teenage stuff so I’ll try to stick to those books in this rec list.
Don’t forget to check the notes every now and again in case others add recs.
Boy meets Boy by David Levithan.
**The Vast Fields of Ordinary by Nick Burd oh my god I love this book and I think it’s perfect for what you’re looking for.
**The Wicked Lovely series has two characters, Irial and Niall, who were in a relationship previously and fall back in love from Ink Exchange onwards (pay special attention to the two ebooks Stopping Time and Old Habits), they aren’t main characters in every book but their relationship is really well written.
**Wide Awake by David Levithan. The boys are already in a relationship so I’m not sure if it falls into the “falling in love” category but from what I remember it’s a really great book.
**Geography Club by Brent Hartinger is one of the first books I read with non-straight characters and has a special place in my heart.
**My Side of the Story by Will Davis. Again, not sure if this will fit with your parameters since it’s been a while since I read it but from what I remember I enjoyed it. Maybe more of a “coming out” story than a “falling in love” story.
**Hero by Perry Moore is one of my ultimate favorite books (gay superhero main protagonist hell yeah). The main character, Thom, is gay and falls in love with another superhero.
Rise of Heroes by Hayden Thorne is also a superhero book with a gay protagonist (I think he’s gay) and from what I’ve heard is pretty good. There are at least 4 books in the series from what I remember.
Two Boys Kissing by David Levithan sounds like it might fit your parameters though I’m not 100% sure.
**The Mortal Instruments series has Alec, a side character, falling in love with Magnus, a bisexual warlock. They are side characters though so not the main focus of the books.
Boyfriends with Girlfriends by Alex Sanchez also sounds like it might fit.
Kings of Ruin by Sam Cameron, has a supernatural element to it involving cars which are possessed apparently.
Don’t Let Me Go by J.H. Trumble, I think this deals more with a long distance relationship from the description but it might fit.
The Culling by Steven dos Santos has been described as a Hunger Games type book with a gay main character who falls for another “Recruit.”
If you’re into comic books the Young Avengers is essential, Billy and Teddy are two of the main characters and both are gay. They end up in a pretty well written relationship.
If you have limited funds or really can’t decide I think your best options are probably Hero by Perry Moore or The Vast Fields of Ordinary by Nick Burd because these are two books that I’m in love with and have been in love with since I read them years ago.
Links to other lists with LGBTQ characters which might catch your interest:
-Lauren